[Python] AttributeError: 'LlmAgent' object has no attribute 'invoke'

I am trying to call Flask API which i alrady running on port 5000 on my system, i am desgning a agentic AI code which will invoke GET and then POSt based on some condition , and using google-adk. I have below code

import requests
from google.adk.agents import LlmAgent
from google.adk.tools.function_tool import FunctionTool

def check_trainer_availability(trainer: str) -> str:
resp = requests.get("http://localhost:5000/availability", params={"trainer": trainer})
return resp.json().get("availability", "unknown")

def book_trainer(trainer: str, trainee: str) -> str:
resp = requests.post("http://localhost:5000/book", json={"trainer": trainer, "trainee": trainee})
return resp.json().get("message", "Booking failed.")

availability_tool = FunctionTool(check_trainer_availability)
booking_tool = FunctionTool(book_trainer)

agent = LlmAgent(
name="TrainerBookingAgent",
model="gemini-1.5-flash",
tools=[availability_tool, booking_tool],
instruction="""
You are an assistant that checks trainer availability using the tool, and books if available.
"""
)

if __name__ == "__main__":
result = agent.invoke("Please book Aisha for John.")
print(" Agent Response:", result.response)


Whenever i am running this i am getting below error:

AttributeError: 'LlmAgent' object has no attribute 'invoke'


I have google-adk version 1.4.1 , still i am getting this issue. Please Help.

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